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 ###Instrução: qual é a soma dos wkts quando os ovrs eram maiores que 2 e econ era maior que 7.84?
 ###Tabelas: CREATE TABLE overall_results_in_clt20 (overall_results_in_clt20_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Matches VARCHAR, Wins VARCHAR, Losses VARCHAR, No Result VARCHAR, Success Rate VARCHAR) CREATE TABLE poland's_voivodeships_1975-98_49_voivodeships (poland's_voivodeships_1975-98_49_voivodeships_id AUTO_INCREMENT PRIMARY KEY, Abbreviation VARCHAR, Voivodeship VARCHAR, Capital VARCHAR, Area km² (1998) VARCHAR, Population (1980) VARCHAR, No. of cities INT, No. of communes INT) CREATE TABLE ultra-low_voltage_processors (ultra-low_voltage_processors_id AUTO_INCREMENT PRIMARY KEY, Model Number VARCHAR, Clock Speed VARCHAR, L1 Cache VARCHAR, L2 Cache VARCHAR, FSB Speed VARCHAR, Clock Multiplier VARCHAR, Idle Power VARCHAR, Socket VARCHAR, Cores INT, Release Date VARCHAR) CREATE TABLE career_statistics (career_statistics_id AUTO_INCREMENT PRIMARY KEY, Year INT, Games INT, Games started INT, Completions INT, Attempts INT, Completion % VARCHAR, Yards INT, Yards/Attempt VARCHAR, Touchdowns INT, Interceptions INT, Rating VARCHAR) CREATE TABLE twenty20_internationals (twenty20_internationals_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Wkts INT, Runs INT, Econ INT, Ovrs INT)  
SELECT SUM Wkts FROM twenty20_internationals WHERE Ovrs > 2 AND Econ > 7.84